65987domain: NAppears in sequencesa(n) = 9 + floor( Sum_{j=1..n-1} a(j)/3 ).at n=31A120154Expansion of Product_{k>=1} 1/(1 - x^k)^(3*k*(k-1)/2+1).at n=12A295179a(n) is the Wiener index of a broom on 2n vertices of which n+2 are pendant.at n=43A349416Number of partitions of n with rank a multiple of 5.at n=52A363237